Copper-aluminum alloy



Patented June 25, 1929.

EUGEN VADEBlS, OF HEDDERNHEIM, NEAR FRANKF ORT-ON-THE-MAIN, GERMANY.

COPPER-ALUMINUM ALLOY.

Ho Drawing. Application filed March 31,, 1927, Serial No. 180,064, and in Germany April 15, 1926.

This invention relates to copper-aluminum-a-lloys. The heat resistance viz, strength in a heated state, of copper-aluminum alloys can be increased by additions of metals such as nickel, iron, manganese and the like. The addition of manganese impartsto these al loys the capability of being hot-pressed. If I however the content of nickel and iron ex- 1o ceeds a certain limit, the alloy loses its capability of beingpressed and is unable to regain same even if the manganese content is increased.

It has now been found possible to obtain copper-aluminum alloys which are capable of being pressed in a heated state by incorporating with said alloys, additions of 1 to 6% of manganese and 0.1 to 2% of tin, and if desired also small amounts of iron and nickel. The amounts of the added iron and nickel should be. so selected that the strength of the resulting alloy, in a heated state, is considerably increased while however the capability of the alloy of being pressed is not adverselyafiected.

By way of example alloys according to the present invention may consist of 5 to 9.5% aluminum, 1 to'6% manganese, 0 to 3% nickel, 0.1 to 3% iron and.0.01 to 2% tin, the 80 remainder being copper.

The strength of an alloy consisting of 84 parts of copper, 9 parts of aluminum, 1 part of manganese, 3 parts of nickel and 3 parts of iron, at 500 0., is 35.7 kg. per sq. mm. If a small amount, e. g. 0.3 parts tin is added to this alloy the strength at the aforesaid temperature is increased toaboutkg. per sq. mm.

Parallel with the increase in strength in the heated state, an extraordinary increase 40 1n the strength of the alloy at ordinary temperature takes place. An alloy consisting of 84 parts of copper, 9 parts of aluminum,

5 parts of manganese and 1.5 parts of iron was found to have a strength of 70.3 kg. per sq. mm. at room temperature, and an elongation of 19.3%. If 0.5 parts of tinare added to the same alloy, the strength in creases to more than 80 kg. per sq. mm., whereas the elongation is only reduced by 2.6%, the same still amounting to 16.7%. The samples were cast in chill moulds. The same alloy without the addition of tin, was found to have a strength of 35 kg. per sq. mm. at 500 C. and with an addition of 0.5 parts of tin, a strength of more than 40 kg. per sq. mm.

The above described alloys may be used for any suitable purposes and have proved particularly useful as bearing metal.

What I claim is:

1. Copper aluminum alloys containing 59.5% aluminum manganese within the limits of 1 to 6% and tin within the limits of 0.01 to 2%.

2. Copper aluminum alloys containing small amounts of nickel and iron, ,5 to 9.5% aluminum, 1 to 6% manganese and .01 to 2% tin.

3. An alloy consisting of 5 to 9.5% aluminum, 1t0 6% manganese, a small amount not exceeding 3% nickel, 0.1 to 3% iron and 0101- to 2% tin, the remainder being copper.

4. An alloy, consisting of 84% copper, 1.5% iron, 5% manganese, 9% aluminum, 0.5% tin. I

i In testimony whereof I aflix my signature.

DR. EUGEN VADERS. 

